Mount routes from extension in Sinatra

gistfile1.rb

# add requires as needed...

# main app
class App < Sinatra::Base
  register Sinatra::Namespace

  # mount routes from extension
  register Sinatra::Guides
  mount_guides

  # mount routes from extension inside a namespace
  namespace '/tours' do
    register Sinatra::Tours
    mount_tours
  end
  get '/' do
    { say: "hello API" }.to_json
  end
end

# modules
module Sinatra
  module Tours
    def mount_tours
      get '/' do
        { say: "tours API" }.to_json
      end
      get '/add' do
        { add: "yeah" }.to_json
      end
    end
  end
  register Tours

  module Guides
    def mount_guides
      get '/' do
        { say: "guides API" }.to_json
      end
      get '/add' do
        { add: "nope" }.to_json
      end
    end
  end
  register Guides
end